| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2924622 | Heart Rhythm | 2008 | 7 Pages |
BackgroundBiventricular (BIV) pacing can improve cardiac function in heart failure (HF).ObjectiveThis study sought to investigate the mechanisms of benefit of BIV pacing using a rabbit model of myocardial infarction (MI).MethodsNew Zealand White rabbits were divided into 4 groups (sham-operated [C], MI with no pacing [MI], MI with right ventricular pacing [MI+RV], and MI with BIV pacing [MI+BIV]) and underwent serial electrocardiograms and echocardiograms. At 4 weeks, hearts were excised and tissue was extracted from various areas of the left ventricle (LV).ResultsFour weeks after coronary ligation, BIV pacing prevented systolic and diastolic dilation of the LV as well as the reduction in its fractional shortening, restored the QRS width and the rate-dependent QT intervals to their baseline values, and prevented the decline of the ether-a-go-go (Erg) protein levels. This prevention of remodeling was not documented in the MI+RV groups.ConclusionIn this rabbit model of BIV pacing and MI, we show prevention of adverse mechanical and electrical remodeling of the heart. These changes may underlie some of the benefits seen with BIV pacing in HF patients with more severe LV dysfunction.
